Drinking mug



FIG. 1 is a side elevational view of a drinking mug showing my new design;

FIG. 2 is a front elevational view

FIG. 3 is a rear elevational view

FIG. 4 is a top plan view showing a portion of the interior of the mug

FIG. 5 is a bottom plan view 

The ornamental design for drinking mug, as shown and described. 